Black and white stretching system and method for improving...

Details Black and white stretching system and method for improving... Black and white stretching system and method for improving...

2007-11-06

2007-11-06

Tran, Phuoc (Department: 2624)

Image analysis

Image enhancement or restoration

Intensity, brightness, contrast, or shading correction

C382S169000

Reexamination Certificate

active

10830400

ABSTRACT:
A black and white stretching system and method for improving contrast of a picture is disclosed. The system includes a histogram distribution calculation unit for calculating a histogram distribution of an input signal of a specified unit, a mean calculation unit for calculating a mean level of the input image signal, a slope calculation unit for calculating black and white stretching slopes in association with the mean level, a ratio calculation unit for calculating a ratio of a picture change based on the histogram distribution of the present input image signal and the previous input image signal, a filtering unit for adjusting the black and white stretching slopes corresponding to the ratio of the picture change, and a stretching unit for stretching the input image signal by mapping the adjusted black and white stretching slopes and the input image signal.

REFERENCES:
patent: 5854851 (1998-12-01), Bamberger et al.
patent: 6148103 (2000-11-01), Nenonen
patent: 6611296 (2003-08-01), Nieuwenhuizen et al.
patent: 07-281633 (1995-10-01), None
patent: 10-126647 (1998-05-01), None
patent: 2000-057335 (2000-02-01), None
patent: 2000-0039940 (2000-07-01), None

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